Privacy policy

Last updated November 7, 2026.

Calculators

The numbers you type into a calculator stay in your browser. They are not sent to us or stored anywhere.

What we collect

We have no accounts, sign-ups or contact forms. Our host, Cloudflare, keeps standard server logs and anonymous visit counts (pages viewed, country, browser type) to keep the site running and to show us which pages are useful. We don't use advertising trackers.

Fonts

Pages load fonts from Google Fonts, so your browser connects to Google's servers when a page opens.

Affiliate links

When you click a link to Amazon or another store, that store may set cookies to know the visit came from us. Their own privacy policies apply on their sites. Amazon's is at amazon.com.

Changes

If this policy changes, the date at the top changes too.